The Qualcomm Atheros QCA9880 802.11nac in my Archer C7 v2 running OpenWRT 15.05 only seems to perform when really close to the AP. Btw I recommend OpenWRT over the stock TP-LINK firmware!! I found it faster for a start.

ac range tests

My first test was from behind my study door, about 5m from the AP... ~15MB/sec

Second test from my study table where it was barely usable, aka out of range. I'd say just over 10m away through a door.

The last test was almost 60MB/sec where my computer was right next to the AP.

X1C3 iperf3 testing next to Archer C7 with OpenWRT 15.05

Update: Opensource Wireless AC doesn't seem to exist sadly. :(

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